Michał Bieniek

Analysis of the similarity between residual magnetic field distribution and the stress and strain state for 7CrMoVTiB10-10 (T/P24) steel

Distributions of the residual magnetic field (RMF) were compared to the results of the calculations of plastic strain and residual stress for samples madeof 7CrMoVTiB10-10 (T/P24)steel. TheRMF was measured on thesurface of samples with a various degree of strain. The calculations of the stress and strain state were conducted by means of the finite elements method with the use of a bilinear model of the material. Qualitative and quantitative relationships were found between plastic strain and the RMF components, as well as between residual stress and the RMF component derivatives. On the basis of the found relationships, thealgorithm fortheevaluation of residual stresswasdeveloped andpreliminarilyverifiedusing themeasurements of the RMF components. The trends of further research aiming to confirm the practical suitability of the developed algorithm for the evaluation of the stress and strain state were formulated.